What is the preferred thickness for the rubbers of the EU professionals ? Does anyone have any examples where they have reliable sources ?
You could safely say that any offensive player would like to have the rubbers produced as close as possible to the maximum 4.0 mm overall thickness mark.
If tolerance for an extra layer of boosting is required, this could be problematic with "max" sponges.
It is more of a weight thing, which corresponds to thickness, but there hasn´t been a thickness indication on any professional ESN rubber I have seen in years, and they were quite a few from all of the big companies.
In that respect, there is no discussion about 1,8 mm sponges, if you thought so?